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PTS
週三 23 1月, 2019 10:54
版面: 天文攝影 Astrophotography
主題: 2019 Jan 22 comet C/2018 Y1 Iwamoto at Hokoon
回覆: 2
觀看: 45

2019 Jan 22 comet C/2018 Y1 Iwamoto at Hokoon

2019 Jan 22 comet C/2018 Y1 Iwamoto at Hokoon C/2018 Y1 is very diffuse, and faint. Telescope: 50-cm RC reflector f/8 camera: ASI1600MM Pro (cooled to -20C) exposure : 8 s time: 19:04:06 UTC and 20:44:16 UTC Note the rapid movement during the 100 minutes between the 2 images. south is up, east to th...
PTS
週三 23 1月, 2019 01:46
版面: 天文攝影 Astrophotography
主題: 2019 Jan 22 comet 38P/ Stephan-Oterma at Hokoon
回覆: 1
觀看: 36

2019 Jan 22 comet 38P/ Stephan-Oterma at Hokoon

2019 Jan 22 comet 38P/ Stephan-Oterma at Hokoon

Telescope: 50-cm RC reflector f/8
camera: ASI1600MM Pro (cooled to -20C)
exposure : 12 s
time: 17:09:16 UTC and 17:36:08 UTC
south is up, east to the left
PTS
週三 23 1月, 2019 01:05
版面: 天文攝影 Astrophotography
主題: 2019 Jan 22 comet 46P/ Wirtanen at Hokoon
回覆: 1
觀看: 38

2019 Jan 22 comet 46P/ Wirtanen at Hokoon

2019 Jan 22 comet 46P/ Wirtanen at Hokoon

Telescope: 50-cm RC reflector f/8
camera: ASI1600MM Pro (cooled to -20C)
exposure : 12 s
time: 16:37:19 UTC and 16:52:11 UTC
south is up, east to the left
PTS
週二 22 1月, 2019 22:06
版面: 天文攝影 Astrophotography
主題: 2019 Jan 22 comet 64P/ Swift-Gehrels at Hokoon
回覆: 2
觀看: 40

2019 Jan 22 comet 64P/ Swift-Gehrels at Hokoon

2019 Jan 22 comet 64P/ Swift-Gehrels at Hokoon

Telescope: 50-cm RC reflector f/8
camera: ASI1600MM Pro (cooled to -20C)
exposure : 20 s
time: 13:40:25 UTC and 13:54:27 UTC
blink the 2 images to see its movement in 14 minutes
estimated magnitude: 16.2
south is up, east to the left
PTS
週二 22 1月, 2019 21:52
版面: 天文攝影 Astrophotography
主題: 2019 Jan 22 Uranus & satellites at Hokoon
回覆: 1
觀看: 29

2019 Jan 22 Uranus & satellites at Hokoon

2019 Jan 22 Uranus & satellites at Hokoon

Telescope: 50-cm RC reflector f/8
camera: ASI1600MM Pro (cooled to -10C)
exposure : 8 s
time: 13:10:57 UTC
cropped 800x600
south is up, east to the left
PTS
週一 21 1月, 2019 14:33
版面: 業餘天文研究專區 Amateur Astronomers' Research Area
主題: Asteroid occultation event on 2019 March 03
回覆: 0
觀看: 29

Asteroid occultation event on 2019 March 03

Asteroid occultation event on 2019 March 03 I've prepared finder charts from: Digital Sky Survey (15 x 15 arcmin and 30 x 30 arcmin) and The Sky 6 (15x11 arcmin) IOTA/IOTA-ES occultation update for (2) Pallas / TYC 0323-01028-1 event on 2019 Mar 03, 19:42 UT Visible from Russia, China, Indonesia, W ...
PTS
週三 16 1月, 2019 11:52
版面: 天文話題 Everything about Astronomy
主題: Amateur Telescope Making - Book 1 - In memory of an old friend, Dr. Lau Tai Chi.
回覆: 3
觀看: 145

Amateur Telescope Making - Book 1 - In memory of an old friend, Dr. Lau Tai Chi.

Amateur Telescope Making - Book 1 - In memory of an old friend, Dr. Lau Tai Chi. One day in 1969, I was in Cat Street, looking for a pair of binocular objectives to make an eyepiece for my newly finished 6-inch f/5 newtonian. While waiting for the shopkeeper to find the lens, an elderly gentleman as...
PTS
週一 14 1月, 2019 12:15
版面: 天文攝影 Astrophotography
主題: Sun, Moon and Mars
回覆: 3
觀看: 102

Sun, Moon and Mars

Sun, Moon and Mars

Date: 2019 Jan 12
Camera: Sony RX10 IV
Lens: Zeiss Sonnar 8.8-220 mm f/2.4-4 (24-600 mm 35-mm equivalent)
PTS
週一 14 1月, 2019 12:13
版面: 花鳥蟲魚 Natural World
主題: Birds and insect
回覆: 5
觀看: 131

Re: Birds and insect

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PTS
週一 14 1月, 2019 12:12
版面: 花鳥蟲魚 Natural World
主題: Birds and insect
回覆: 5
觀看: 131

Re: Birds and insect

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